linux-kernel - [PATCH] PM: Add pm_ops

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Date:	Tue, 30 Apr 2013 10:09:22 +0900
From:	Jingoo Han <jg1.han@...sung.com>
To:	"'Rafael J. Wysocki'" <rjw@...k.pl>
Cc:	linux-pm@...r.kernel.org, 'Len Brown' <len.brown@...el.com>,
	'Pavel Machek' <pavel@....cz>,
	'Andrew Morton' <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Wolfram Sang <wsa@...-dreams.de>,
	linux-i2c@...r.kernel.org, Jingoo Han <jg1.han@...sung.com>
Subject: [PATCH] PM: Add pm_ops_ptr() macro

Add pm_ops_ptr() macro that allows the .pm entry in the driver structures
to be assigned without having an #define xxx NULL for the case that PM is
not enabled.

Signed-off-by: Jingoo Han <jg1.han@...sung.com>
---
 drivers/i2c/busses/i2c-s3c2410.c |    8 +-------
 include/linux/pm.h               |    2 ++
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 6e8ee92..e7b6639 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -1218,7 +1218,6 @@ static int s3c24xx_i2c_resume(struct device *dev)
 }
 #endif
 
-#ifdef CONFIG_PM
 static const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = {
 #ifdef CONFIG_PM_SLEEP
 	.suspend_noirq = s3c24xx_i2c_suspend_noirq,
@@ -1226,11 +1225,6 @@ static const struct dev_pm_ops s3c24xx_i2c_dev_pm_ops = {
 #endif
 };
 
-#define S3C24XX_DEV_PM_OPS (&s3c24xx_i2c_dev_pm_ops)
-#else
-#define S3C24XX_DEV_PM_OPS NULL
-#endif
-
 /* device driver for platform bus bits */
 
 static struct platform_driver s3c24xx_i2c_driver = {
@@ -1240,7 +1234,7 @@ static struct platform_driver s3c24xx_i2c_driver = {
 	.driver		= {
 		.owner	= THIS_MODULE,
 		.name	= "s3c-i2c",
-		.pm	= S3C24XX_DEV_PM_OPS,
+		.pm	= pm_ops_ptr(&s3c24xx_i2c_dev_pm_ops),
 		.of_match_table = of_match_ptr(s3c24xx_i2c_match),
 	},
 };
diff --git a/include/linux/pm.h b/include/linux/pm.h
index a224c7f..bd50d15 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -55,8 +55,10 @@ struct device;
 
 #ifdef CONFIG_PM
 extern const char power_group_name[];		/* = "power" */
+#define pm_ops_ptr(_ptr)	(_ptr)
 #else
 #define power_group_name	NULL
+#define pm_ops_ptr(_ptr)	NULL
 #endif
 
 typedef struct pm_message {
-- 
1.7.2.5


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